<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格</title>
</head>
<body>
<!--
tr: 行 rowspan: 跨行
td: 列 colspan: 跨列
border:　边框
th: 表头
-->
<table border="1px">
    <th colspan="3">表头</th>
    <tr>
        <td>1-1</td>
        <td>1-2</td>
        <td>1-3</td>
    </tr>
    <tr>
        <td>2-1</td>
        <td>2-2</td>
        <td>2-3</td>
    </tr>
    <tr>
        <td>3-1</td>
        <td>3-2</td>
        <td>3-3</td>
    </tr>
    <tr>
        <td colspan="2">4-1</td>
        <td rowspan="2">4-2</td>
    </tr>
    <tr>
        <td colspan="2">5-1</td>
    </tr>
</table>

</body>
</html>